solubility rules, change in oxidation, ions per formula, sum of coefficients. #7

Question

solubility rules, change in oxidation, ions per formula, sum of coefficients.
#7, 15, 17, 19.

a. strong base 0 b. weak base ? strong acid e . weak acid 7. Solubility rules predict precipitate formation for mixing 0.1 M aqueous solutions of a. NaBr and NH,NO, b. Nal and KBr Li,CO, and NHI d. K,so, and Ba(NO,)2 8. Which of these metals is least active (not easily oxidized)? a. Ca b. K Pt 9. Which of the following is an endothermic process ? a. deposition of iodine crystals from violet vapor b. water freezing C. boiling soup condensation of water vapor neb 10. Calculate E for a system that loses 60 J of heat and does 200 J of work on the surroundings a. 150 J b. 100 J ?260 J 200 J god. How much heat is released as the temperature of The specific heat of iron is 0.444 9.52 g of iron is decreased from 50.0 C to 10.0°c? 11. a, 169 J b. 211 J c. 42.3 J d. 376 J 12 Oxidation numbers of the underlined elements in H,CrO, and Seo, are respectively a. +3, +5 b. +5, +3

Explanation / Answer

7. Most salts of Na+, K,+ and NH4+ are soluble. Thus, salts formed after mixing the compounds given in (a), (b), and (c) are al soluble. In (d) formation of BaSO4 occurs, which is insoluble. Thus (d). (Ans)

15. Oxidation state of S in SO42- is +6. (S atom is double bonded to 2 O atoms, and single bonded to 2 O atoms). In PbS, oxidation state is +2. Thus answer is option (a). (Ans)

17. Ions prduced from (a) are Na+ and ClO3-; Ions from (b) are K+ and Cl-; ions from (c) are Na+ and NO3- and ions from (d) are 2K+ and CO32-. Thus option (d). (Ans)

18. Balanced rection of combustion of CH4 is

CH4 + 2O2 ---> CO2 + 2H2O

Thus, the sum of coefficients are 1+2+1+2= 6. Option (c) (Ans)

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